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Pretax Income (Loss) for Domestic and Foreign Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ (590) $ 125 $ 114
Foreign (366) 162 153
Income (Loss) before income taxes $ (956) $ 287 $ 267